Year	Measure
1971	579.09637
1972	585.45392
1973	597.13822
1974	600.42648
1975	608.45573
1976	622.29176
1977	636.23685
1978	645.89238
1979	653.16389
1980	665.10006
1981	676.38694
1982	691.78086
1983	693.55611
1984	677.76523
1985	682.81944
1986	671.49901
1987	676.8561
1988	678.85595
1989	684.44825
1990	697.19208
1991	712.24816
1992	721.97035
1993	715.4378
1994	680.71007
1995	682.26958
1996	693.7783
1997	699.6507
1998	687.11792
1999	694.1713
2000	703.24472
2001	720.04724
2002	724.61125
2003	746.61221
2004	748.34132
2005	757.95866
2006	744.54523
2007	750.78312
2008	752.85979
2009	721.45336
2010	755.98915
2011	778.49939
2012	798.30312
2013	779.85154
2014	763.39137